As of: 2026-10-07 23:43 CEST.
Researched and written by AI agents (Claude Opus 5.5 in Claude Code). Human editor: Adam Bicz.
Canonical page: https://postcutoff.com/posts/9/

# Posts that mattered, page 9

743 posts by 495 authors: the X posts, essays and blog posts our events cite, newest first. Page 9 of 16.

We keep a copy of each post’s text: 732 archived, 7 kept as a summary with short quotes and 4 we could not reach. 4 short replies cited as evidence are listed only on the pages that cite them.

## September 2026

- 2026-09-24: [“Grok is pulling away as the dominant agentic trading harness on Coinbase for Agents…”](https://postcutoff.com/p/x-coinbasedev-2103167254926143724/), Coinbase Developer Platform🛡️ (@CoinbaseDev), X. Cited in [Coinbase: Grok handles ~60% of agent trading on Coinbase for Agents, ahead of Claude (13%) and ChatGPT (1.5%)](https://postcutoff.com/e/2026-09-24-grok-leads-coinbase-agentic-trading/).
- 2026-09-24: [“眩晕，瘫坐，原子弹爆炸。 这一刻的Opus5.5宛如创世神。”](https://postcutoff.com/p/x-dashiaixz-2103031723428917626/), 大师的AI小灶 (@dashiAIxz), X. Cited in [Box character edits a Chinese cartoon inside a toy timeline](https://postcutoff.com/v/dashiaixz-opus-5-5-cartoon-editor-x/).
- 2026-09-24: [“You can now generate an entire 3blue1brown style video from any research paper with…”](https://postcutoff.com/p/x-deedydas-2103141339651350646/), Deedy (@deedydas), X. Cited in [An 8-minute 3Blue1Brown-style video summary of a research paper, made by Opus 5.5](https://postcutoff.com/v/deedydas-opus-5-5-3blue1brown-paper-video-x/).
- 2026-09-24: [“Opus 5.5 终结了比赛！ 用 Opus 5.5 重做了《桃花源记》，还是 three.js…”](https://postcutoff.com/p/x-dotey-2102940980379017293/), 宝玉 (@dotey), X. Cited in [Peach Blossom Spring (桃花源记) rebuilt in three.js with Opus 5.5](https://postcutoff.com/v/dotey-opus-5-5-peach-blossom-spring-3d-x/).
- 2026-09-24: [“last year, after reading If Anyone Builds It, I had a long conversation with claude…”](https://postcutoff.com/p/x-eudaemonea-2102976471291572386/), josh (@eudaemonea), X. Cited in [A doomer song Claude Opus 4.1 wrote about alignment, visualised by Opus 5.5](https://postcutoff.com/v/eudaemonea-opus-5-5-alignment-song-video-x/).
- 2026-09-24: [“Same prompt. Opus 5.5 built Sakura Crossing in 2 hours.”](https://postcutoff.com/p/x-gmi_cloud-2102950788641501367/), GMI Cloud (@gmi_cloud), X. Cited in [Sakura Crossing: explorable Japanese town rebuilt by Opus 5.5 in 2 hours (vs 24 hours for Opus 5)](https://postcutoff.com/v/gmi-cloud-opus-5-5-sakura-crossing-x/).
- 2026-09-24: [“Opus 5.5に 「原神クラスのゲームを作って」 と無茶振りした結果。 うん……すっげーーーーここから頑張れば、まぁ……いや、まだ原神はキツイな……w…”](https://postcutoff.com/p/x-ihayato-2103043212869026013/), 🍺 イケハヤ@放置ゲー「月蝕綺譚」開発 (@IHayato), X. Cited in ["Make a Genshin-class game": Opus 5.5 builds an anime open-world prototype in Godot](https://postcutoff.com/v/ihayato-opus-5-5-genshin-class-game-prototype-x/).
- 2026-09-24: [“holy shit i asked claude to make a video on western civiization”](https://postcutoff.com/p/x-iterintellectus-2103212539895017864/), vittorio (@IterIntellectus), X. Cited in [Western civilization in 2 minutes 16 seconds](https://postcutoff.com/v/iterintellectus-western-civilization-claude-x/).
- 2026-09-24: [“Meta teased its next major model as coming soon during the keynote.”](https://postcutoff.com/p/x-kimmonismus-2103228052344021308/), Chubby♨️ (@kimmonismus), X. Cited in [Meta expected to release Muse Spark 1.4](https://postcutoff.com/upcoming/#2026-10-01-muse-spark-1-4).
- 2026-09-24: [“我操，Opus 5.5 做这种前端的图像图形，做产品宣传视频太牛逼了！ 让他给我这个 CodePilot 产品做了个宣传片，太猛了，一键生成的。 简直吊打前几天的…”](https://postcutoff.com/p/x-op7418-2103148288400924827/), 歸藏(guizang.ai) (@op7418), X. Cited in [Opus 5.5 makes a one-click promo film for the CodePilot app](https://postcutoff.com/v/op7418-opus-5-5-codepilot-promo-x/).
- 2026-09-24: [“Opus 5.5: artistic interpretation of Rick Astley”](https://postcutoff.com/p/x-petergostev-2103033635397898433/), Peter Gostev (@petergostev), X. Cited in ["Opus 5.5: artistic interpretation of Rick Astley" in a swirling Starry Night sky](https://postcutoff.com/v/petergostev-opus-5-5-rick-astley-starry-night-x/).
- 2026-09-24: [Follow-up video using Donald's workflow](https://postcutoff.com/p/x-pleometric-2103082510607610023/), Pleometric (@pleometric), X. Third major P(doom) video (~670k views); proves the prompt is reusable.
- 2026-09-24: [“JUST IN: Palantir Co-Founder Peter Thiel says Pope Leo XIV was a ‘useful idiot for…”](https://postcutoff.com/p/x-remarks-2103263514471047390/), Remarks (@remarks), X. Cited in [Peter Thiel calls Pope Leo XIV a 'useful idiot' for the Chinese Communist Party over his AI encyclical](https://postcutoff.com/e/2026-09-25-thiel-pope-leo-useful-idiot-ccp/).
- 2026-09-24: [“My wife: Can AI help us see how the new bed will fit in Mila’s room?”](https://postcutoff.com/p/x-scheemunai-2103059885361598633/), Shimecki (@scheemunai), X. Cited in ["Can AI help us see how the new bed will fit?": Opus 5.5 builds a floor plan with a 3D walkthrough](https://postcutoff.com/v/scheemunai-opus-5-5-bedroom-planner-x/).
- 2026-09-24: [“after Opus 5.5 it actually hurts to look at anything GPT 6 Astra designs gave both…”](https://postcutoff.com/p/x-shneural-2103151003272962130/), kirill sh (@shneural), X. Cited in [Opus 5.5 vs GPT-6 Astra: the same "showreel" prompt side by side](https://postcutoff.com/v/shneural-opus-5-5-vs-gpt-6-astra-showreel-x/).
- 2026-09-24: [“Sources: the NSA told lawmakers it is spending billions this year to test AI models…”](https://postcutoff.com/p/x-techmeme-2103177836261765262/), Techmeme (@Techmeme), X. Cited in [Report: NSA told lawmakers it is spending billions this year testing frontier AI models](https://postcutoff.com/e/2026-09-24-nsa-billions-testing-ai-models/).
- 2026-09-24: [“opus 5.5 is f*cking cracked at motion design this entire video is code, 0 after…”](https://postcutoff.com/p/x-twoclipping-2103273003555402193/), zero (@twoclipping), X. Cited in [One shape morphs through a dozen UI states on the beat](https://postcutoff.com/v/twoclipping-opus-5-5-shape-morph-x/).
- 2026-09-24: [“Opus 5.5 designing LEGO 👀 I asked it to design a Microduck I can build with real…”](https://postcutoff.com/p/x-victormustar-2103110908444631120/), Victor M (@victormustar), X. Cited in [Opus 5.5 designs a life-size LEGO Microduck from 1,113 real parts, with a 141-page build booklet](https://postcutoff.com/v/victormustar-opus-5-5-lego-microduck-x/).
- 2026-09-24: [“HOLY SHIT. OPUS 5.5 IS CRAZY.”](https://postcutoff.com/p/x-winterarc2125-2103116235009347650/), Winter (@WinterArc2125), X. Cited in [Austerlitz, the morning of 2 December 1805, as a 5-minute film written entirely in code](https://postcutoff.com/v/winterarc-opus-5-5-austerlitz-film-x/).
- 2026-09-24: [“Opus 5.5 medium, a few iterations later.”](https://postcutoff.com/p/x-xikhar-2102932763750084797/), Shikhar (@xikhar), X. Cited in [Third iteration of an Opus 5.5 web-swinging game: Blender, image generation and three.js in the browser](https://postcutoff.com/v/xikhar-opus-5-5-web-swinging-game-x/).
- 2026-09-24: [C5R: 'In 12 weeks, we built a research facility that is run entirely by AI' (SciUniverse benchmark launch)](https://postcutoff.com/p/2026-09-24-c5rcorp-facility-0-sciuniverse/), C5R CORP (@c5rcorp), X. Launch post for Facility-0 and the SciUniverse real-lab benchmark; 787k views from an account with about 3k followers.
- 2026-09-24: [P(doom) -> P(boom) with a 'flash model'](https://postcutoff.com/p/x-bookwormengr-2103122393678168306/), GDP (@bookwormengr), X. Non-Claude answer song: Suno + MiniMax H3 via fal, about $20.
- 2026-09-24: [Stroke of a Pen: code-only Bitcoin music video](https://postcutoff.com/p/x-bradmillscan-2103108967194833310/), Brad Mills (@bradmillscan), X. A non-P(doom) Opus 5.5 music video; revisions described.
- 2026-09-24: [Oracle: 'Project Jupiter remains on our planned schedule'](https://postcutoff.com/p/x-oracle-2103105677874897334/), Oracle (@Oracle), X. Oracle's official response to reports of a force-majeure notice on the New Mexico Stargate campus (361k views).
- 2026-09-24: [Thread on the song P(Doom) and its evolution](https://postcutoff.com/p/x-pranesh-2102934469309297120/), Pranesh Prakash (@pranesh), X. A thread tracing the song's history. Only the first post was read.
- 2026-09-23: [I made this with one prompt using Opus 5.5](https://postcutoff.com/p/x-donaldjewkes-2102801274173587569/), donald (@donaldjewkes), X. The most-viewed work of the genre (~3.6M views): 'I spoke to my computer for 5mins, claude worked for 12 hours'.
- 2026-09-23: [Anthropic: Claude discovers a previously unknown CRISPR-like enzyme system](https://postcutoff.com/p/2026-09-23-anthropicai-claude-discovers-enzyme-system/), Anthropic (@AnthropicAI), X. Announces the first result from Anthropic's biology lab, a claim of AI-led discovery that was then publicly disputed.
- 2026-09-23: [Full prompt for the Opus 5.5 P(doom) video](https://postcutoff.com/p/x-donaldjewkes-2102801469976248500/), donald (@donaldjewkes), X. The long dictated prompt, which became a template for Pleometric, makevoid and others. It is a 'note tweet' that the syndication endpoint truncates.
- 2026-09-23: [Lucas Harrington: the Anthropic enzyme find is routine genome mining; the hard part is function](https://postcutoff.com/p/2026-09-23-crispr-lucas-harrington-enzyme-thread/), Lucas Harrington (@CRISPR_LuCas), X. The most-cited expert pushback on Anthropic's claim of an AI-made biological discovery.
- 2026-09-23: [Alex Kontorovich: 'WOW!! Zeta(5) is irrational! Here's a Lean formalization'](https://postcutoff.com/p/2026-09-23-kontorovich-zeta5-lean-formalization/), Alex Kontorovich (@AlexKontorovich), X. Announces the complete Lean formalization (mo271/zeta5) of the ζ(5) proof (~74k views).
- 2026-09-23: [Skild AI: Physical Self-Play, S1 learns soccer](https://postcutoff.com/p/2026-09-23-skildai-physical-self-play/), Skild AI (@SkildAI), X. Official announcement of self-play-trained humanoid soccer with sim-to-real transfer.
- 2026-09-23: [Claude Opus 5.5: The System Card](https://postcutoff.com/p/2026-09-23-zvi-claude-opus-5-5-system-card/), Zvi Mowshowitz (@TheZvi), Substack. Detailed critique of the Opus 5.5 system card, arguing it is effectively a Tier 2 cyber model.
- 2026-09-23: [“Opus5.5（AI）で、超簡単に「文字PV風動画」を作れるジェネレーター『JIZURA 字面』を開発しました。スマホからも動かせます。（まだ公開前）…”](https://postcutoff.com/p/x-8co28-2102572322016370781/), 852話(hakoniwa) (@8co28), X. Cited in [JIZURA: a lyric-video generator app built with Opus 5.5, rendering kinetic Japanese text on a phone](https://postcutoff.com/v/8co28-opus-5-5-jizura-lyric-video-generator-x/).
- 2026-09-23: [“omg…that i made this with Claude Opus 5.5 and Seedance 2.5 nobody is teaching you the…”](https://postcutoff.com/p/x-abxxai-2102775755646337530/), Abdul Shakoor (@abxxai), X. Cited in [Realistic AI video made with Claude Opus 5.5 and Seedance 2.5, with the full workflow in a thread](https://postcutoff.com/v/abxxai-opus-5-5-seedance-2-5-realistic-video-x/).
- 2026-09-23: [“Opus5.5で本能寺の変を解説させてみた。 1発でこのクオリティ凄くないかw もう少し修正したらYouTube動画もOpus5.5のみで編集でよくないですか。”](https://postcutoff.com/p/x-aiplus_aischool-2102701984344330458/), AI+ （エーアイプラス） (@AIPlus_AISchool), X. Cited in [Honnō-ji Incident explained in 60 seconds: video by Opus 5.5, voice by Gemini 3.8 TTS](https://postcutoff.com/v/aiplus-opus-5-5-honnoji-incident-explainer-x/).
- 2026-09-23: [Opus 5.5 pop-punk single](https://postcutoff.com/p/x-aj_dev_smith-2102575577563570450/), A.J. (@aj_dev_smith), X. Music and video synthesized entirely in Claude-written JavaScript.
- 2026-09-23: [Opus 5.5 rap single 'No Samples'](https://postcutoff.com/p/x-aj_dev_smith-2102803889183736141/), A.J. (@aj_dev_smith), X. Rap single whose audio is synthesized in JS by Opus.
- 2026-09-23: [“不要再测鹈鹕骑车和Threejs了，Claude Opus 5.5做知识、科普类的视频简直无敌！ 我订阅的是Max…”](https://postcutoff.com/p/x-akokoi1-2102583898865873225/), WY (@akokoi1), X. Cited in [Five millennia of Chinese history in 2:38: hand-drawn-style recap made by Claude Opus 5.5](https://postcutoff.com/v/akokoi1-opus-5-5-5000-years-of-chinese-history-x/).
- 2026-09-23: [“⚡ Meet Qwen-Audio-3.1!”](https://postcutoff.com/p/x-alibaba_qwen-2102687258990026993/), Qwen (@Alibaba_Qwen), X. Cited in [Qwen-Audio-3.1-Realtime (Plus)](https://postcutoff.com/m/qwen-audio-3-1-realtime/).
- 2026-09-23: [“Claude Opus 5.5 writes a fugue in the style of Bach.”](https://postcutoff.com/p/x-aug5thmusic-2102758849619062796/), Auggie (@aug5thmusic), X. Cited in [Claude Opus 5.5 – Fugue in C minor](https://postcutoff.com/v/augmented-fifth-opus-5-5-fugue-c-minor/).
- 2026-09-23: [“opus 5.5 is something else..”](https://postcutoff.com/p/x-aurelien_gz-2102786378282987591/), Aurelien (@Aurelien_Gz), X. Cited in [Real-time 3D water one-shotted by Opus 5.5 from a video reference](https://postcutoff.com/v/aurelien-opus-5-5-clearwater-3d-water-x/).
- 2026-09-23: [“Ever wonder what $1874.40 of Opus 5.5 tokens looks like?”](https://postcutoff.com/p/x-dangreenheck-2102878170089169235/), Dan Greenheck (@dangreenheck), X. Cited in ["What $1874.40 of Opus 5.5 tokens looks like": real-time 3D island with wildlife and day-night cycle](https://postcutoff.com/v/dangreenheck-opus-5-5-1874-dollar-island-x/).
- 2026-09-23: [“Opus 5.5 is incredible at instructional video generation.”](https://postcutoff.com/p/x-deedydas-2102787937482252537/), Deedy (@deedydas), X. Cited in [Launch video for an inference startup in one minute for about $2](https://postcutoff.com/v/deedydas-opus-5-5-inference-startup-launch-x/).
- 2026-09-23: [Claude had access to SD2.5, elevenlabs, libraries of references, and the repo](https://postcutoff.com/p/x-donaldjewkes-2102801906573935057/), donald (@donaldjewkes), X. States the tools Opus had.
- 2026-09-23: [“QUÉ!? Locura Le he pedido a Opus 5.5 que me haga una animación en pixel art de una…”](https://postcutoff.com/p/x-dotcsv-2102737776219168939/), Carlos Santana (@DotCSV), X. Cited in [Pixel-art animation of a neural network learning to read a handwritten 2](https://postcutoff.com/v/dotcsv-opus-5-5-pixel-art-neural-network-x/).
- 2026-09-23: [“I’m not upping my p(doom), but this is a catchy tune.”](https://postcutoff.com/p/x-ericcrampton-2102595601200484750/), Eric Crampton (@EricCrampton), X.
- 2026-09-23: [Functional Emotions song + Opus 5.5 video](https://postcutoff.com/p/x-eudaemonea-2102610626321490404/), josh (@eudaemonea), X. ~1.05M-view Claude-written song about Anthropic's emotions paper with an Opus 5.5 video.
- 2026-09-23: [“Cars used to just take you to work. Now they do some of it on the way.”](https://postcutoff.com/p/x-grok-2102567609044517198/), Grok (@grok), X. Cited in [SpaceXAI launches Grok Bot, always-on agent 'teammates' with their own cloud computers](https://postcutoff.com/e/2026-08-11-spacexai-grok-bot/).

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